USB virtual desktop (model U170) user guide
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Minimum system requirements
Host computer
For multiuser applications the host computer operating system can be Windows Server 2003 R2
SP2 (Standard or Enterprise Edition, 32-bit), Windows Server 2008 SP2 (Standard or
Enterprise, 32-bit. For more information Microsoft licensing please see the Important Notices
section at the beginning of this document.
Almost any modern PC may be used to host NComputing vSpace software. The guidelines
below are a good rule of thumb for determining how many users you can expect to have a
native experience running general productivity software applications.
The table below describes the maximum bandwidth of the USB bus for modern PC
motherboards. Some PCs may contain multiple EHCI controllers that can double or
triple the available bandwidth. These systems will have better video performance when
running more than 4 U170 devices on a PC. To take advantage of multiple controllers,
connect any downstream hubs back to the PC directly rather than connecting all U170s
downstream of one USB connection. Adding an additional USB controller card to a PC
is also an option for large deployments.
Vendor
Chip Set
USB or EHCI controllers
Maximum Bandwidth
AMD
SB710
2
120 MB/s
Broadcom
HT1100
3
180 MB/s
Intel
ICH8
2
120 MB/s
Intel
ICH9
2
120 MB/s
Intel
ICH10
2
120 MB/s
nVIDIA
ION Series
2
120 MB/s
* Note: This is NOT a comprehensive list of chip set that have more than one USB bus.
Note: The U170 requires USB 2.0 controller(s) for operation. In addition, some
older PCs may have difficulty booting with U170 devices (or other high-speed
USB audio devices) when attached. In these cases, you may need to boot the
computer first, then attach the USB cable. This problem can sometimes be
resolved by installing a separate USB 2.0 PCI card into the PC.
